Process for the production of disinfecting solutions which are capable of being regenerated



ascertained hitherto.

Patented June 23, 1925.

UNITED STATES PATENT OFFICE.

n'nna'r worn, or Bram, ommanr.

IBOCESS FOR THE PRODUCTION OF DISINFECTIHG' SOLUTIONS THIGH ABE CAPABLE.

. OF BEING 1T0 Drawing.

To all whom it may concern:

Be it known that I, ALBERT Worm, a citizen of the Prussian State, and residingr at 13/14 Hedemannstrasse, Berlin S. W.,' ermany, have invented a certain new and useful Process for the Production of Disinfect-- ing Solutions Which are Capable of Being Regenerated, of which the following is a specification.

It has already been proposed by saturating water and neutral and more particularly acid salt solutions with ozone to produce aqueous ozone solutions, which may contain, when neutral chlorides are used, up to 8.9 mg. ozone to the liter, gerature and concentration of the solution.

uch solutions, however, are not stable and their titer, as tests have proved, decreases from hour. to hour, and goes. back to zero in the course of 24 hours, the disinfecting power being lost.

It has been found that considerably more stable disinfecting solutions are obtained, if neutral or only slightly alkaline but not 25 acid solutions of the chlorides of such metals as are capable of forming hypochlorites be; treated in the course of several days repeatedly with ozone. The value of the thiosulphate titer of the solution increases constantly during such treatment. For example, an 8 per cent neutral magnesium chloride solution after being once saturated with. ozone showed a titer of 30 0. cm. N/ 100 thiosulphate, on being resaturated after 2" days 260.8 c. cm., after 8 days 498 c. cm. and after a further 6 da 's 692 c. cm. The. surprising fact was revealed that this solution showed no ozone or hydrogen peroxide reaction, but contains hypochlorite, as far as has been Hence the process is suitable for the regeneration of hypochlorite solutions, which owing to disintegration have entirely or almost entirely lost their content of hypochlorite having a disinfecting action and have substantially become converted into chloride solutions. The formation of hypochlorite from chloride solutions by means of ozone is assisted by the presence of even quite small quantities of metallic oxides, which possibly have a catalyticv action, such as oxide of iron, oxide of copper, oxide of nickel and the like. Hence from solutions of perfectly pure metallic chlorides solutions have been obaccording to the tem-;

Application fled. July 7', 1924. Serial :0. 724,714.

tained having aconsiderably lower thiosulphate tlter and consequently a lower disinfecting power than from chloride solutions Examples.

(1) 3000 0. cm of an 8%- magnesium.

chloride solution containing traces of oxide of iron are exposed in an absorption tower in a finely divided state for 1. hour to the action of ozone, after which the solution will be saturated. In the course of several days this solution is treated with ozone: four times, 1 hour at av time, i. e. till it is resaturated. Its titer will then be, about 7 00' 0. cm. N/IOO thiosulpha'te to the. liter, but can be still further increased. by further treatment with ozone at suitableintervals.

(2) A hypochlorite: solution, which has so far lost its ypochlorite. content as to have become inefiective, may be diluted until it contains: no more than 10% chloride, is mixed with a very small quantity of oxide of iron and is thereupon treated with ozone to the point of saturation, until it has a sufficientl high titer.

1. process for producing; hypochlorite solutions, consisting in treating neutral or only slightly alkaline dilute aqueous solutions of chlorides of metals capable of forming hypochlorites with ozone until they are saturated with the latter, the said treatment being re ated severaltimes and spread over a consi erable period, as set forth.

2'. A process for producing hypochlorite solutions, consisting in treating neutral or only slightly alkaline dilute aqueous solutions of chlorides'of metals capable of forming hypochlorites with ozone in the prese ce: of a metallic oxide until they are satura ed with ozone, the said treatment being re ted several times and spread over a considerable period, as set forth.

In testimony whereof. I have name to this specification.

ALBERT woman... 7

n d my 

